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详细说明：HART(Highway Addressable Remote Transducer)，可寻址远程传感器高速通道的开放通信协议，是美国ROSEMOUNT公司于1985年推出的一种用于现场智能仪表和控制室设备之间的通信协议HART Communication Foundation document Number HCF SPEC-54
FSK Physical Layer Specification
ERRATA
This errata provides guidance for proper implementation of the HArT FSK Physical Layer with respect
to the requirements for Carrier Stop/ Carrier Decay timing, time from Carrier On to Start of first
Character, and time from Last Character to Carrier Off. Requirements for these parameters were
inadvertently ommitted or relaxed in HCF SPEC-54, Revision 8. 1 and unfortunately, were not
discovered prior to the specification release
Device designers should use the following requirements for these parameters. FSK Physical Layer
Specification Revision 8.2 will correctly state the requirements listed below and incorporate
requirements important for the design of HART modem chips
Carrier Stop/carrier Decay Timing requirements
Carrier Stop and decay Timing in Revision 8. 1 was inadvertently made less restrictive than Revision
8.0, taking time away from the Data Link layer. The proper requirements for these parameters are as
follows
Change from
Change te
Carrier Stop Time
5 bit times
3 bit times
(RTS dissassertion to below 80mv)
Carrier Decay time
Change from
Change to
(rtS dissassertion to carrier below maximum 15 bit times
6 bit times
acceptable noise amplitude
Character Start/Stop Requirements
Timing with respect to characters' was inadvertently omitted from Revision 8.0, but the Physical Layer
can not allow unmodulated carrier or trailing dribble? bits/bytes. Therefore, the requirements of
Physical Layer Specification Revision 7. 2 are reinstated as follows: (Note: definition has been modified
to include Carrier Stop and Start time requirements
Time from rts assertion to first Character start bit
5 bit times
Time from last character to carrier off
11 bit times
(carrier below maximum acceptable noise amplitude
Revision 8.1 Release date: may 9. 2000
HART Communication Foundation document Number HCF SPEC-54
FSK Physical Layer Specification
Revision 8.1 Release date: may 9. 2000
HART CoMmunication foundation document number: HCF SPEC-54
FSK Physical Layer Specification
Table of contents
Preface
Introduction
1 Scope…………………………
14
2 Normative references
············+········:···:..······:·
2.1 Related hART Documents
14
2.2 Rclated Communication documents ......................... 1 4
2.3 Other related documents
3 Definitions ..
4 Symbols and Abbreviations
20
5 Physical Device Types……..…..….….….,.….…….….….………...2l
5.1 Low Impedance Devices
·.········
21
5.2 High Impedance Devices................................21
5.3 Device Connection Types….,,,,,,,…………22
5.3.1 Current Input( ormerly Primary Master)………23
5.3.2 Current Output(Formerly Type C Field Device)....... 24
5.3.3 Voltage Input (New)
24
5.3.4 Voltage Output( Formerly voltage Mode Slave Device)…………24
5.3.5 Secondary(Formerly Secondary Master)
……………………………3
24
5.3.6 Transmitter Formerly Type a or b slave device).......25
537 Actuator(New)…..........25
5.3.8 Non-DC Isolated Bus( Formerly Type a slave in multi-drop mode).25
5.3.9 DC Isolated Bus device(Formerly Type d Field Device)......25
6 Network Configuration Rules
26
6.1 Definitions of elements ..................................................................26
6.2 Combination of elements
26
6.2.1 Rule number 1
26
6.2.2 Rule number 2
26
6.2.3Rulenumber3.wwwwwwwwwwwww.26
6.2.4 Rule number 4
26
6.2.5 Rule number 5
26
6.3上 xample Topologies…………….......…27
6.3. 1 Point to Point Current Input......................27
6.32 Point to Point Current Output……
····
28
6.3.3 Multi-drop
29
Revision 8.1, Release Date: August 24. 1999
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HART Communication foundation document number: HCF SPEC-54
FSK Physical layer Specification
6.3.4 Multi-drop with Analog Signaling
30
6.3.5 Series Connection . ...................................................................................3
7 Common Characteristics of All Device Types………
133
7.1 Digital Signaling Requirements………….……………….….3
7.1. 1 Digital Signaling spectrum
7.1.2 Digital Signaling Characteristics
7. 1. 3 Transmitted Waveform
7.1. 4 Receiver Characteristics ...........................................................................36
7.2 Analog Signaling Requirements……
37
7. 2. 1 Analog Signaling Spectrum
37
7.2.2 Analog Signaling Interference on Digital Signaling
着垂D垂垂
38
7.2.3 Analog Input recommendations ..........38
7. 3 Other Characteristics
.38
7.3.1 Device Impedance
38
7.3.2 Interference to Analog Signaling……
40
7.3.3 Output During Silence(Interference on Digital Signaling)....... 40
7.4 Test Requirements…
7.4.1 Test loads
7.4.2 Analog Test Filter
4.
7.4.3 Digital Test Filter
垂垂D音·音音音垂垂
7.5 Cable Characteristics and Lengths
43
7.5.1 Cable Types...
··········································
43
7.5.2 Recommended Minimum Conductor Size(Diameter)
43
7.5.3 Calculated Single-Pair Length ...................43
7.5.4 Maximum Multi-Pair Lengt
246
8 Non-Communicating Network Devices
50
8. 1 Network Power Supply
50
8.1.1 Power distribution and barriers
.音·.,。着音,。音垂4音垂垂。音,音
8. 1.2 Shielding and grounding
52
8.2 Barriers
8. 3 Miscellaneous hardware
55
ANNEX A. Discussion and derivation of specifications.....................57
A-5.3 Device Connection Types
57
A-6.2 Combination of elements
鲁非音垂音番章4音垂音;4·音章看音音音音·看·音垂看垂4章看垂
.58
a-6.2.I Rule number 1
58
a-6.2.2 Rule Number 2
58
Revision 8. 1, Preliminary H, Release Date: August 24, 1999
Page 4 of 88
HART CoMmunication foundation document number: HCF SPEC-54
FSK Physical Layer Specification
a-6.2.3 Rule number 3
59
a-6.2.4 Rule Number 4
a-6.2.5 Rule Number 5
59
A-6.3 Example topologies......................59
A- 7.1.2 Digital Signaling Characteristics
∴59
A-7.1. 3 Transmitted Waveform
垂4·,音4垂音垂垂垂·自非音
650
A-7. 1.4 Receiver Characteristics
A-7.2. 1 Analog Signaling Spectrum
62
A- 7.2.2 Analog Signaling Interference on Digital Signaling
2
A-7.3.1.1 High Impedance Devices……
.63
A-7.3.1.2 Low Impedance Devices
音,·,着看·垂音
…64
A-7.3.1.3 Secondary Device Impedance…………
67
A-7.3.2 Interference to Analog Signaling
….67
A-7.3.2. 1 Carrier Start/Stop
A-7.3.2. 3 Cyclic Connection Transients
A-7.3.3 Output During Silence (Interference on Digital Signaling)
a-7,.1 Test loads
垂看垂,垂,音;非;垂。垂中垂音垂垂垂垂垂垂音垂垂音垂音·着,音音音垂看垂;垂,音垂着音垂自垂音垂垂
70
A-7.5. I Cable types……,….,…,,..,……,…,.….,,.,….….,…….,71
A-7.5.2 Recommended Minimum Conductor Size Diameter)
71
A-7.5.3 Calculated Single-Pair Length
71
a-8.1 Network Power Supply
77
A-8 1.2 Shielding and Grounding
78
a-8.2 Barriers
78
A-8.3 Miscellaneous Hardware………
78
ANNEX B. Wire Resistance table
79
BI. Additional cable Length Graphs
80
ANNEX C. Document Revision history. ........................................................................88
Cl. Changes from Rev 8.0 to Rev 8.I........................88
Revision 8.1, Release Date: August 24.1999
Page 5 of 88
HART Communication foundation document number: HCF SPEC-54
FSK Physical layer Specification
Revision 8. 1, Preliminary H, Release Date: August 24, 1999
Page 6 of 88
HART CoMmunication foundation document number: HCF SPEC-54
FSK Physical Layer Specification
List of Figures
Fi
gure I
Data Link Layer and Physical Layer Relationship
13
F
igure
Carrier Decay Time............................
15
Figure 3
Carrier start Time
16
Figure 4
Carrier Stop time
16
Figure 5. HART Digital Signaling Frames
17
Figure 6. HaRT Byte Format
18
igure
7
Point to point current Input Topology
27
Igure8. Point to Point current Output Topology.………
28
Figure9. Multi- drop Topology.……….…….…..……………9
Figure 10. Multi-drop with Analog Signaling Topology
30
Figure 11. Series Connection Topology ....3
Figure12. Digital Signaling Spectrum……
Figure 13. Example of Phasc-Continuous Frcquency-Shift-Kcying ...34
Figure 14
Transmit waveform limits
·;······4···
35
Figure 15. Receiver Out-of-Band Interference Limit(Peak-to-Peak Volts).....37
Figure 16. Analog Signaling Spectrum
37
Figure 17
Allowable Output Noise
Figure 18. Example Test Load Topologies
42
Figure 19
Length Graph- Single Devicc Network
47
Figure20. Length graph, Capacitance/ Resistance ratio=1000.……………148
Figure 21
Length Graph, Capacitance/Resistance Ratio=2000
音章音音。
…48
Figure 22 Length Graph, Capacitance/Resistance Ratio=5000.......49
Figure 23. Length Graph, Capacitance/Resistance Ratio=10000..... 49
Figure 24. Power Supply ripple
50
Figure 25. Network Power Supply Connections......5
Figure 26
Grounding and Shielding...,.,.,,…………,.52
Figure27A, Barrier Test circuit……
Figure 27B. Barrier Test Circuits
…5
Figure 27C. Barrier Test Circuits
55
Figure 28. Receive Band-Pass Filter..................... 62
Revision 8.1, Release Date: August 24. 1999
f88
HART Communication Foundation Document Number: HCF SPEC-54
FSK Physical Layer Specification
Figure 29. Output from HART filter with filtered 16 mA square wave input(500 w load)63
Figure 30. High Impedance Device Models............64
Figure 31. Primary Master Signal Sensing Arrangement
66
Figure 32. Low Impedance Device Modcl..............66
Figure 33. Secondary Device Model
Figure 34. 65 ms Rule Capacitance limits.....................73
Figure 35. Worst-Case Combination of Network Resistances; Current Signaling .......73
Figure 36. Signal Amplitude Capacitance Limits; Current Source.
Figure 37 Worst-Case Combination of Network Resistances; Voltage Signaling...75
Figure 38. Signal Amplitude Capacitance Limits; Voltage Source.......76
Figure 39. Capacitance/Resistance=1000; 100 W Series resistance
80
Figure 40. Capacitance/ Resistance=1000; 200 W Series Resistance
80
Figure 41. Capacitance/Resistance= 1000; 300 W Series resistance
81
Figure 42. Capacitance/Resistance=1000; 400 W Series resistance
81
Figure 43. Capacitance/Resistance= 2000: 100 W Series Resistance
82
Figure 44. Capacitance/Resistance =2000: 200 W Series Resistance
…82
Figure 45. Capacitance/Resistance= 2000: 300 W Series resistance..........83
Figure46 Capacitance/ Resistance=2000;400 W Series resistance………….83
Figure 47. Capacitance/Resistance=5000: 100 W Series resistance
·········
84
Figure 48. Capacitance/Resistance=50000; 200 W Series Resistance
Figure 49. Capacitance/Resistance = 5000; 300 W Series resistance ........85
Figure 50. Capacitance/Resistance =5000: 400 W Series Resistance........85
Figure 51. Capacitance/Resistance=10000; 100 W Series resistance
.86
Figure 52. Capacitance/Resistance=10000; 200 W Series Resistance
86
Figure 53. Capacitance/Resistance =10000; 300 W Series Resistance
.87
gure 54
Capacitance/Resistance=10000; 400 W Series resistance
87
Revision 8.1, Release Date: August 24. 1999
Page of88
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